Abstract
To reduce trailing-edge noise an investigation of a prospective active noise control technique is presented. Large-eddy simulations (LES) and solutions of the acoustic perturbation equations (APE) are used to investigate the trailing-edge noise of a flat plate at a freestream Mach number 0.6 and a Reynolds number of 12000 based on the boundary layer thickness �0 at the inflow boundary. An additional body force is introduced upstream of the turbulent boundary layer having a spanwise mode based on the wavelength and the temporal scale of the turbulent boundary layer. The modified velocity field has a much smaller wall-shear stress reducing the wall pressure fluctuations. The results include the analysis of turbulent structures which are responsible for the noise generation. It is shown by two-point correlations of pressure and velocity components that the turbulent scales at the trailing edge decrease in the streamwise and spanwise direction. The overall sound pressure level evidences a noise reduction up to 3–5dB over a wide range of the radiation angle.
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